package yw.substart.example.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.*;

/**
 * @author lwq 719812998@qq.com
 * @date 2017/8/23
 * @comment Map 转换工具
 */
public class MapUtil {

    private static final Logger logger = LoggerFactory.getLogger(MapUtil.class);

    /**
     * bean 转map
     * @param obj
     * @return
     */
    public static Map<String, Object> transBean2Map(Object obj) {
        if(obj == null){
            return null;
        }
        Map<String, Object> map = new HashMap<>();
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
                // 过滤class属性
                if (!key.equals("class")) {
                    // 得到property对应的getter方法
                    Method getter = property.getReadMethod();
                    Object value = getter.invoke(obj);
                    map.put(key, value);
                }
            }
        } catch (Exception e) {
            logger.error("bean 转 Map：" + e.getMessage());
        }
        return map;
    }

    /**
     * map 转 bean
     * @param map
     * @param obj
     */
    //map 转 bean
    public static void transMap2Bean(Map<String, Object> map, Object obj) {
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
                if (map.containsKey(key)) {
                    Object value = map.get(key);
                    // 得到property对应的setter方法
                    Method setter = property.getWriteMethod();
                    setter.invoke(obj, value);
                }
            }
        } catch (Exception e) {
            logger.error("map 转 bean", e);
        }
    }
}
